I just looked in The Royal Road To Card Magic and I cannot find Braue's invisible pass (described in The Invisible Pass), Hugard and Braue's "Invisible Turnover Pass" (described in Expert Card Technique), the Herrmann pass (from which the previous two evolved), or Laurie Ireland's dip cover for the classic pass (called "The Invisible Pass" by Brad Christian of Ellusionist fame).
I also looked in the index under "invisible" (which wasn't there), and "pass" (which had "The Pass", "Riffle Pass", "Spread Pass" (Not LePaul's. A classic pass followed by spreading out the cards), and "Spring Pass") without finding anything resembling anything I have heard of being called "The Invisible Pass".
Furthermore, the book does not have any pages that are numbered with roman numerals, and thus the index does not refer to any pages using roman numerals.
So in short, are you sure that you are actually reading The Royal Road To Card Magic?
Andru
http://www.practicenotincluded.com/